I am an NRI, I have a rental income from a house which I own in India. I am employed in UK and I receive salary income in UK. What income should I offer in India?

For NRI’s Income which is earned or accrued in India is taxable in India.
Rental income which is received in India is taxable in India.
Income which is earned outside India is not taxable in India, hence salary income received by an NRI in UK is not taxable in India.
Hence the income which should be offered in India is the rental income from a house owned in India.